/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.solr.internal.csv;

import org.apache.solr.SolrTestCaseJ4;

public class CharBufferTest extends SolrTestCaseJ4 {
  public void testCreate() {
    CharBuffer cb = new CharBuffer();
    assertEquals(0, cb.length());
    SolrTestCaseJ4.expectThrows(IllegalArgumentException.class, () -> new CharBuffer(0));
    cb = new CharBuffer(128);
    assertEquals(0, cb.length());
  }

  public void testAppendChar() {
    CharBuffer cb = new CharBuffer(1);
    String expected = "";
    for (char c = 'a'; c < 'z'; c++) {
      cb.append(c);
      expected += c;
      assertEquals(expected, cb.toString());
      assertEquals(expected.length(), cb.length());
    }
  }

  public void testAppendCharArray() {
    CharBuffer cb = new CharBuffer(1);
    char[] abcd = "abcd".toCharArray();
    String expected = "";
    for (int i = 0; i < 10; i++) {
      cb.append(abcd);
      expected += "abcd";
      assertEquals(expected, cb.toString());
      assertEquals(4 * (i + 1), cb.length());
    }
  }

  public void testAppendString() {
    CharBuffer cb = new CharBuffer(1);
    String abcd = "abcd";
    String expected = "";
    for (int i = 0; i < 10; i++) {
      cb.append(abcd);
      expected += abcd;
      assertEquals(expected, cb.toString());
      assertEquals(4 * (i + 1), cb.length());
    }
  }

  public void testAppendStringBuilder() {
    CharBuffer cb = new CharBuffer(1);
    StringBuilder abcd = new StringBuilder("abcd");
    String expected = "";
    for (int i = 0; i < 10; i++) {
      cb.append(abcd);
      expected += "abcd";
      assertEquals(expected, cb.toString());
      assertEquals(4 * (i + 1), cb.length());
    }
  }

  public void testAppendCharBuffer() {
    CharBuffer cb = new CharBuffer(1);
    CharBuffer abcd = new CharBuffer(17);
    abcd.append("abcd");
    String expected = "";
    for (int i = 0; i < 10; i++) {
      cb.append(abcd);
      expected += "abcd";
      assertEquals(expected, cb.toString());
      assertEquals(4 * (i + 1), cb.length());
    }
  }

  public void testShrink() {
    String data = "123456789012345678901234567890";

    CharBuffer cb = new CharBuffer(data.length() + 100);
    assertEquals(data.length() + 100, cb.capacity());
    cb.append(data);
    assertEquals(data.length() + 100, cb.capacity());
    assertEquals(data.length(), cb.length());
    cb.shrink();
    assertEquals(data.length(), cb.capacity());
    assertEquals(data.length(), cb.length());
    assertEquals(data, cb.toString());
  }

  // -- the following test cases have been adapted from the HttpComponents project
  // -- written by Oleg Kalnichevski

  public void testSimpleAppend() {
    CharBuffer buffer = new CharBuffer(16);
    assertEquals(16, buffer.capacity());
    assertEquals(0, buffer.length());
    char[] b1 = buffer.getCharacters();
    assertNotNull(b1);
    assertEquals(0, b1.length);
    assertEquals(0, buffer.length());

    char[] tmp = new char[] {'1', '2', '3', '4'};
    buffer.append(tmp);
    assertEquals(16, buffer.capacity());
    assertEquals(4, buffer.length());

    char[] b2 = buffer.getCharacters();
    assertNotNull(b2);
    assertEquals(4, b2.length);
    for (int i = 0; i < tmp.length; i++) {
      assertEquals(tmp[i], b2[i]);
    }
    assertEquals("1234", buffer.toString());

    buffer.clear();
    assertEquals(16, buffer.capacity());
    assertEquals(0, buffer.length());
  }

  public void testAppendString2() {
    CharBuffer buffer = new CharBuffer(8);
    buffer.append("stuff");
    buffer.append(" and more stuff");
    assertEquals("stuff and more stuff", buffer.toString());
  }

  public void testAppendNull() {
    CharBuffer buffer = new CharBuffer(8);

    buffer.append((String) null);
    assertEquals("", buffer.toString());

    buffer.append((CharBuffer) null);
    assertEquals("", buffer.toString());

    buffer.append((char[]) null);
    assertEquals("", buffer.toString());
  }

  public void testAppendCharArrayBuffer() {
    CharBuffer buffer1 = new CharBuffer(8);
    buffer1.append(" and more stuff");
    CharBuffer buffer2 = new CharBuffer(8);
    buffer2.append("stuff");
    buffer2.append(buffer1);
    assertEquals("stuff and more stuff", buffer2.toString());
  }

  public void testAppendSingleChar() {
    CharBuffer buffer = new CharBuffer(4);
    buffer.append('1');
    buffer.append('2');
    buffer.append('3');
    buffer.append('4');
    buffer.append('5');
    buffer.append('6');
    assertEquals("123456", buffer.toString());
  }

  public void testProvideCapacity() {
    CharBuffer buffer = new CharBuffer(4);
    buffer.provideCapacity(2);
    assertEquals(4, buffer.capacity());
    buffer.provideCapacity(8);
    assertTrue(buffer.capacity() >= 8);
  }
}
